The Comte d'Auvergne, the natural son of Charles IX and Marie Touchet, was an ally of Biron's and put on his trial at the same time. Their common offense had been to invite invasion by the Spaniards and stir up a revolution throughout France. D'Auvergne was sentenced to death and with him the Comte d'Entragues, who had married Marie Touchet, but neither suffered. D'Auvergne remained in the Bastile for twelve years. He was released in the following reign and made a good appearance at court as the Duc d'Angoulême. Henry IV had been moved to soften the rigors of his imprisonment and wrote to the governor (Sully) saying that as he had heard his nephew d'Auvergne needed change of air, he was to be placed in "the pavilion at the end of the garden of the arsenal which looks upon the water, but to be guarded in any way that seemed necessary for the security of his person."
Reference must be made to one inmate of the Bastile at this period, the Vicomte de Tavannes, who was opposed to Henry IV as a partisan of the League. He was long held a prisoner but was exchanged for the female relations of the Duc de Longueville; and Tavannes has written in his "memoirs:" "A poor gentleman was thus exchanged against four princesses, one a Bourbon, one of the House of Cleves, and two of that of Orleans." At the fall of the League, Tavannes acknowledged Henry IV on condition that he should be confirmed in his dignity as a marshal of France. This promise was not kept and he withdrew from his allegiance, saying he was the King's subject and not his slave. For this he was again committed to the Bastile from which he escaped, according to his own account, with great ease,--"A page brought me some thread and a file; I twisted the cord, filed through a bar and got away." He was not pursued but was suffered to remain in peace in his own castle of Soilly, near Autun. The King could never tolerate Tavannes. He had been largely concerned in the massacre of St. Bartholomew, of which he is believed to have been the principal instigator and which he is supposed to have suggested to Catherine de Medicis.
Henry's reign was abruptly terminated by his assassination in 1610. He was murdered by François Ravaillac, a native of Angoulême who was no doubt a victim of religious dementia. Having been much perturbed with visions inciting him to exhort the king to take action against the followers of the pretended reformed religion and convert them to the Roman Catholic Church, Ravaillac determined to do so. On reaching Paris he went to the Jesuits' house near the Porte St.-Antoine and sought advice from one of the priests, Father Daubigny, who told him to put these disturbed thoughts out of his head, to say his prayers and tell his beads. He still maintained his intention of speaking to the King and addressed to him on one occasion as he drove by in his coach, but "the King put him back with a little stick and would not hear him." Then Ravaillac changed his mind and set out for home; but on reaching Estampes, was again impelled to return to Paris--this time with homicidal intent. The would-be regicide watched for the King constantly, but thought it better to wait until after the new queen (Marie de Medicis) was crowned. He hung about the Louvre, burning to do the deed, and at last found his opportunity on the 14th of May, 1610, near the churchyard of St. Innocent. The King left the Louvre that morning in his coach unattended. One of his gentlemen had protested. "Take me, Sire, I implore you," he said, "to guard your Majesty." "No," replied the King, "I will have neither you nor the guard. I want no one." The coach was driven to the Hotel de Longueville and then to the Croix du Tiroir and so to the churchyard of St. Bartholomew. It had turned from the rue St. Honore into the rue Feronnière, a very narrow way made more so by the small shops built against the wall of the churchyard. The passage was further blocked by the approach of two carts, one laden with wine and the other with hay, and the coach was brought to a stop at the corner of the street.